Omega3/MemoryGate.cpp at main · h5n1xp/Omega3 · GitHub

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//
//  Common.cpp
//  SDL3Test
//
//  Created by Matt Parsons on 06/03/2026.
//

#include "MemoryGate.hpp"

void MGate::Init(uint32_t bas, uint8_t* dat, int siz){
    base = bas;
    data = dat;
    size = siz;
    mask = siz - 1;
}


uint32_t MGate::Read8(uint32_t address){

    address -= base;
    address &= mask;

    return data[address];
}
uint32_t MGate::Read16(uint32_t address){

    address -= base;
    address &= mask;

    //uint16_t* p = (uint16_t*)&data[address];
    //return __builtin_bswap16(*p);
   // uint16_t temp = (*p >> 8) | (*p << 8);
    return (data[address] << 8) | (data[address + 1]);
}
uint32_t MGate::Read32(uint32_t address){

    address -= base;
    address &= mask;

    //uint32_t* p = (uint32_t*)&data[address];
    //return __builtin_bswap32(*p);
    //uint32_t temp = ((*p << 8) & 0xFF00FF00) | ((*p >> 8) & 0xFF00FF);
    //temp = (temp << 16) | (temp >> 16);
    //return temp;

   return (data[address] << 24) | (data[address+1] << 16) | (data[address+2] << 8) | (data[address+3]);

}


void MGate::Write8(uint32_t address, uint32_t value){

    address -= base;
    address &= mask;

    data[address] = value;
}
void MGate::Write16(uint32_t address, uint32_t value){

    address -= base;
    address &= mask;

    //uint16_t* p = (uint16_t*)&data[address];
   // *p = __builtin_bswap16(value);
    //*p = (value >> 8) | (value << 8);
    data[address]     = value >> 8;
    data[address + 1] = value;

}
void MGate::Write32(uint32_t address, uint32_t value){


    address -= base;
    address &= mask;

    //uint32_t* p = (uint32_t*)&data[address];
    //*p = __builtin_bswap32(value);
    //uint32_t temp = ((value << 8) & 0xFF00FF00) | ((value >> 8) & 0xFF00FF);
    //*p = (temp << 16) | (temp >> 16);

    data[address]     = value >> 24;
    data[address + 1] = value >> 16;
    data[address + 2] = value >> 8;
    data[address + 3] = value;
}